Extract DB queries from MaintenanceLive into context

test/music_library/maintenance_test.exs

@@ -0,0 +1,26 @@
+defmodule MusicLibrary.MaintenanceTest do
+  use MusicLibrary.DataCase
+
+  alias MusicLibrary.Maintenance
+
+  describe "vacuum/0" do
+    test "delegates to Repo.vacuum/0" do
+      # VACUUM cannot run inside the Ecto sandbox transaction,
+      # so we verify it attempts the operation and returns the expected tuple shape.
+      assert {:error, %Exqlite.Error{message: "cannot VACUUM from within a transaction"}} =
+               Maintenance.vacuum()
+    end
+  end
+
+  describe "optimize/0" do
+    test "returns {:ok, _}" do
+      assert {:ok, _} = Maintenance.optimize()
+    end
+  end
+
+  describe "count_active_jobs/1" do
+    test "returns 0 for a worker with no jobs" do
+      assert Maintenance.count_active_jobs("MusicLibrary.Worker.NonExistent") == 0
+    end
+  end
+end